| 摘要 |
PROBLEM TO BE SOLVED: To achieve a downsizing and cost cutting in a shutter for camera and to prevent an aperture blade from bouncing. SOLUTION: The shutter is provided with an aperture blade 50 movable between an exposing position and a home position, a sector 40 movable between a opening position and a closing position, a single electromagnetic driving source 60 as a controlling mechanism for driving the sector 40 and the aperture blade 50, a spring 70 regulating the movement of the sector 40 toward the closing position and capable of releasing the regulation by driving force with a predetermined level or more generated by the electromagnetic source when the aperture blade 50 is positioned at the exposing position, and a controlling means. When the diaphragm is operated, the sector moves to the closing position in advance and is put back to a predetermined distance. Then the aperture blade is positioned at the exposing position.
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